If you received tubers that started growing long stems looking for light in your mailing package, do not fret. You can get two or three extra plants from your tuber by planting the stems separately, plus plant the healthy tuber. A tuber sprouting with growth is always good news.
Recently I found a box of tubers in peat that all looked long the spider Daddy Long Legs, But all of their legs were white. Each Dahlia tuber clump had sprouts/stems that grew the length of the box and back. All of that growth energy is not going to be wasted. I am going to use it to my advantage.
If you ever find yourself in this situation the best advice is to cut those stems off close to the base of the tuber where they originated. More sprouts will come from that same area. Wiggle off or cut with a sterile knife. If you were to plant with those leggy white stems you would not have strong straight stems. They are likely to flop over or be crooked from being bent one way and then growing at a different angle after planting. Plus the added weight of the flowers later could break the stems. So I cut these way back and save these foot-long sprouts.
You can now plant your Dahlia tuber as usual in prepared soil and water after planting if there is not much moisture in your soil. Often in the Spring the soil has plenty of moisture and I do not water after planting. The Spring rains do that for me, but I realize not everyone gets as much rainfall as we do in Maryland.
You are now left with those white leggy stems and what I do is cut the long ones in half and pot these all in a potting soil/compost mixture with coarse sand added and/or vermiculite. You want the roots to be free to grow and not be bound or sitting in “soggy soil.” Do not buy potting soil with fertilizer in it as this usually ends of burning them and your success rate won’t be so high. The stems are white but the portion above the soil will slowly green up in a few days with sunlight.
In approximately two weeks the stems should start growing roots under the soil. Don’t keep pulling the stem out to check as those roots can easily break off. When new growth shows and the leaves start to grow you will know they have rooted. Success. The roots will form from the leaf nodes under the soil. You can now plant them in your garden and make sure the soil is free draining and does not dry out.
The first Dahlia plants that grow from those stems will likely bloom before your tubers that you planted. A fun fact. They will also grow small tubers the very first season, possibly three to five small tubers before the growing season is over. A great way to increase your Dahlia collection.
If you give Dahlias a chance they are anxious to grow in the right conditions and will give you bouquets of all sizes and shapes of flowers. The diversity is delightful.
Dahlias are one of the most beloved summer-blooming flowers for gardens. Their massive, showstopping blooms come in a stunning range of hues forms and sizes. Dahlias can be cultivated from tubers or begun from seeds. When raising dahlias from seed, it’s thrilling to observe the seeds sprout and seedlings emerge. But what do dahlia sprouts resemble at different growth phases?
What Dahlia Seeds Look Like
Dahlia seeds are really enclosed in small, slender seed pods that are around 0.5 inches long. The seed pods are simple to split open to gather the seeds inside. Dahlia seeds themselves are very small, about 1-3 mm long or around the size of a pinhead. They may be different colors from brown, tan, gray, or even blackish. The seed is somewhat flattened and oval shaped.
How to Start Dahlia Seeds
To grow dahlia sprouts from seeds start the seeds indoors 6-8 weeks before your last expected spring frost. Plant them 1⁄8 inch deep in seed starting mix. Keep the soil moist and warm at 70-75°F for the best germination, which takes 1-2 weeks. Once sprouted move seedlings under lights and pot up into larger containers once roots fill the cells. Grow the dahlia sprouts on until all danger of frost has passed before transplanting into the garden.
What Dahlia Sprouts Look Like When First Germinating
Once planted, dahlia seeds will take between 7-14 days to germinate and send up their first sprouts At first, you’ll just notice the soil beginning to shift slightly as the radical (root) emerges from the seed Soon after, the tiny shoot will emerge.
Young dahlia sprouts are quite small and delicate when they first pop up The stem is thin, no more than 2-3 mm thick The oval-shaped cotyledon (seed leaves) are around 5 mm across. They may emerge upright or laying sideways on the soil. The stem and leaves will be pale green or even yellowish in color at first.
Dahlia Sprout Growth After 1-2 Weeks
In the first week or two after emerging, dahlia sprouts put on rapid growth. The stems lengthen and start to become more upright. The cotyledons expand in size. The first set of true leaves begin to unfurl at the top of the stem. These leaves are opposite each other and are distinctly separated by length along the stem.
By two weeks old, dahlia sprouts will have stems about 2.5-5 cm tall. The oval cotyledons are 1-1.5 cm across. The first pair of true leaves are smaller, around 0.5 cm long, with a narrow and pointed shape. More sets of leaves continue to form as the sprout grows taller.
Dahlia Seedling Growth at 3-4 Weeks Old
At 3-4 weeks after germination, dahlia sprouts take on even more growth. Stems rapidly lengthen, becoming 5-10 cm tall or more. The stems are slender but toughening up. Leaves enlarge to 1-3 cm long and develop a more defined shape with distinct veins visible.
More vertical distance develops between leaf sets along the stem as it elongates. Smaller leaves emerge from the top while lower leaves continue expanding outward. More branching may begin lower on the stem.
Dahlia Seedlings at 5-6 Weeks Old
By 5-6 weeks of growth, dahlia sprouts are well established young seedlings. They have the appearance of a miniature dahlia plant now. Stems are 10-15+ cm tall and toughened. Leaves are larger, 2-5 cm long emerging from the stem. They may begin to show the distinct dahlia leaf shape, which is bipinnate or fern-like.
The young plants have filled out the cells or pots with a mass of leaves and numerous side shoots emerging lower on the stems. Some early varieties may begin to show small flower buds at the stem tops, though most don’t bloom until after transplanting to the garden.
Young Dahlia Plants Just Before Transplanting
After 8-10 weeks of indoor growth, dahlia sprouts have matured into young dahlia plants ready to be moved outdoors. Stems reach 15-30 cm tall for smaller types or up to 60 cm for larger varieties. The plants appear bushy with many leaves and side shoots.
The young plants have a distinct dahlia appearance at this point. Leaves are medium to dark green, 5-10 cm across, and doubly pinnate with many leaflets emerging from the central petiole. Any early flower buds are larger. Flowering types can be determined once they bloom.
Transplanting Dahlia Sprouts into the Garden
Once all danger of frost has passed and soil has warmed, the young dahlia plants can be moved into the garden. Transplant them 18-24 inches apart in a sunny location with enriched soil. Keep well watered. Most dahlia seedlings will begin flowering 60-90 days after transplanting. Deadhead to encourage more blooms until frost.
Common Problems with Dahlia Sprouts
Growing dahlia sprouts does take some care. Here are some potential issues to watch for:
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Damping off disease – avoid overwatering seedlings. Improve airflow.
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Leggy, weak stems – ensure sprouts get enough light. Move lights closer or use grow lights.
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Slow growth – could indicate improper temperature or watering issues. Optimal temps are 70-75°F.
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Failure to sprout – dahlia seeds can have low viability. Start extra seeds to ensure enough sprouts.
Follow the tips above for the best results sprouting dahlia seeds and growing the seedlings into beautiful, flowering dahlia plants for your garden!
dahlia tubers sprouted, what do dahlia plants look like when they sprout
FAQ
What do dahlias look like when they sprout?
Dahlias grow from tubers, which are swollen underground stems. They sprout “eyes,” which develop into stems and flower stalks. Dahlia tuber clusters look like an upside-down bouquet of sweet potatoes.
How long does it take a dahlia to sprout?
Often, the tubers don’t sprout until they have been in the ground (or in a pot) for 4 to 6 weeks.